1)It is+形容词+that
It is conceivable that knowledge plays an important role in our life.
可想而知，知识在我们的一生中扮演着一个重要的角色。
2)It is+形容词+to do/ doing
She had said what it was necessary to say.
她已经说了一切有必要说的话。
3)祈使句/名词+and/ or
Work hard, and you will finally be able to reach your destination.
努力工作，你就能实现自己的目标。

4)as+many/ much+名词+as
It is said that visitors spend only half as much money in a day in Leeds as in Lon-don.
据说，游客每天在利兹的花销仅为在伦敦的一半。
5)倍数词+as+形容词+as
The reservoir is three times as big as it was ten years ago.
这个水库的面积是十年前三倍。
6) 倍数词+ more +名词/形容词十than
Smoking is so harmful to personal health that it kills seven times more people each year than automobile accidents.
吸烟对人体健康的危害极大，每年死于吸烟的人比死于车祸的人多七倍。

7)(not)as/ so...as(和……(不)一样)
The environmental problems are not as serious as they suggested in their report.
环境问题没有他们在报告中说得那么严重。
8)no more...than(与……一样不)
She is no more fit to be a manager than a schoolgirl would be
一个女学生固然不宜当经理，她也同样不宜。
9)Nothing is more...than(没有比……更……的;……是最……的)
Nothing is more important than to receive education.
没有比接受教育更重要的事。

10)感官动词+of+名词
They hurriedly escaped into a cave that smelt of terror.
他们仓皇地逃人一个充满恐怖气氛的山洞。
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11)without/ not so much as(甚至没有)
Disappointed with her husband，Mary left home without so much as looking back at him.
出于对丈夫的失望，玛丽离开了家，甚至都没有回头看他一眼。

12)may/ might as well(…as)(与其……还不如……)
One may as well not know a thing at all as know but imperfectly.
与其一知半解还不如彻底蒙在鼓里。
13)too...to(太……而不能……;极其地)
It was not too bright of them to settle in an area where earthquakes frequently occur
他们选择在地震多发的地区定居，这可不是个明智的决定。
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14)only to find/ see(结果却;没想到会)
He spent almost all his money to buy the hen which was said to be able to lay gold eggs, only to find it could not lay eggs at all.
为了买那只据说能下金蛋的母鸡，他几乎倾家荡产，没想到这只鸡根本不会下蛋。

15)It is undoubted that/ There is no doubt that(毫无疑问，……)
There is no doubt that war can be avoided if we get down to peace talk.
毫无疑问，如果我们肯认真和谈就能避免战争。
16)rather than(而不是……)
Rather than pursue money to achieve happiness，we should focus on the improvement of ourselves.
我们应该集中精力改善自我，而不是追求金钱的享乐。
17)not... until(直到……才)
We can't release the film until we have the approval from the authority concerned.
直到获得有关当局的批准我们才能发行那部电影。

18)so/ such(…)that(如此……以至于)
With the rumor spreading fast, their anxiety was such that they could not sleep/they became so anxious that they could not sleep.
在谣言迅速散播的情况下，他们焦虑异常，无法人睡。
19)(The) chances are that(很可能……)
Chances are that she has already known it, and there is no need for us to keep the secret.
她很可能已经知道了，所以我们没有必要再保守这个秘密。
20)It occurred to sb. that(突然想到……)
It had never occurred to Cinderella she would become a princess someday.
辛德瑞拉从来没有想到她会成为一位王妃。